Lightning protection system

Equipment within structures, from a sink connected to both the water and sewer lines to a personal computer connected to both the electric power and phone or antenna circuits, become additional points for lightning current to arc between A complete lightning protection system addresses this issue through bonding or the interconnection of metallic building systems with the lightning system to create a Internal arcing between grounded systems is also a function of how many paths we have from the roof lightning protection system to the grounding system. There are multiple international, national, corporate and military lightning protection standards. The remainder is bypassed around sensitive electronics using Some structures are inherently more or less at risk of being struck by lightning. If the underground cable is able to resist Additional precautions must be taken to prevent side-flashes between conductive objects on or in the structure and the lightning protection system.

The Standards in the United States for complete lightning protection systems include Water running off copper will oxidize aluminum and galvanized surfaces, so coordination of system design must include galvanic considerations for potential mounting problems. © 2020 Lightning Protection Institute | Website by Lightning protection components below the strike terminals may be Materials suitable for use in lightning protection systems are The atmosphere surrounding us is electrically charged, but free air maintains a relatively balanced ion distribution.

Although the lightning protection Standards and the National Electrical Code only When surge protection devices send energy to the ground system this instantaneous connection of all wiring systems functions to provide The exposed components for a lightning protection system are copper, aluminum, or other metal designed to carry current, provide bonding connections, and remain functional in an open weather environment. Lightning rods are also called finials, air terminals, or strike termination devices. If lightning hits the structure, it will preferentially strike the rod and be conducted to ground through a wire, instead of passing through the structure, where it could start a fire or cause electrocution. The main attribute common to all lightning rods is that they are all made of conductive materials, such as The principle of the lightning rod was first detailed by As buildings become taller, lightning becomes more of a threat. UL has issued a “Master Label” product for systems fully compliant with their Standard UL 96A for many years. The idea was that glass objects, being non-conductors, are seldom struck by lightning. Therefore, placement with the view of carrying the Since splitting the lightning along multiple paths begins at the strike termination point and follows through the conductor system to ground, different resistance values of electrodes can upset this function. Early on, Christian churches tried to prevent the occurrence of the damaging effects of lightning by prayers. None of these systems claims to protect against 100% of the possibility of a lightning … Since lightning protection may be considered an option, it is crucial that the specifier, construction contractor, and property insurer be familiar with the national Standards to provide the highest level of safety available. It has become the standard by which traditional Franklin Rod systems are installed. When lightning strikes the barn, the wooden structure and its contents may be ignited by the heat generated by lightning current conducted through parts of the structure. If the distance between potential paths is short enough the Since internal grounded building systems permeate a structure, this potential exists at roof level, on or in building walls, and even potentially below grade.

During the period of political confrontation between Britain and its American colonies, British scientists maintained that a lightning rod should have a ball on its end, while American scientists maintained that there should be a point. Rods or 'Air Terminals' - The small, vertical protrusions designed to act as the 'terminal' for a lightning discharge. 1.1 Scope. Lightning usually enters and exits an aircraft through the outer surface of its These paths are constructed of conductive materials. As a general rule, overhead power lines with voltages below 50 kV do not have a "static" conductor, but most lines carrying more than 50 kV do. The most dramatic changes involved in lightning protection system design come from adaptations in how we build and outfit the modern building, or what we might call the “indoor plumbing factor”.

Ideally, the underground part of the assembly should reside in an area of high ground conductivity. A ground loop is required for every structure All grounding media in or on a structure shall be interconnected to provide a The major current carrying components of the lightning protection system were described in their earliest form by Benjamin Franklin. Contracting with professionals qualified through the LPI process ensures an added level of quality assurance for initial system installation and a resource for future inspection and maintenance of existing systems.Lightning protection systems for structures are typically not a requirement of national building codes, although the Standards may be adopted by the authority having jurisdiction for general construction or specific occupancies. Alternate paths from interior grounded circuitry are not designed to carry lightning current (a fire hazard), and junctions in metallic pipes are not designed as current carrying devices leading to heat deformation or shock problems.

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